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Speed, speed limits and road traffic accidents under free flow conditions

Lookup NU author(s): Dr Andrew Metcalfe


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The relationship between various measures of traffic speed, under free flow conditions, and accident rate is investigated for two groups of sites, one in the Tyne and Wear county of the UK and the other in Bahrain. The effect of speed limits on traffic speed is estimated for both groups of sites. In Bahrain, there is statistically significant evidence of an association between mean speed and accident rate. In Tyne and Wear the statistical evidence is weaker, and points to a stronger relationship between accidents and the variability of traffic speeds. In both areas, there is an apparent decrease in accident rate if the percentage of heavy vehicles increases, with the speed distribution held constant. In both areas the effect of speed limits is to reduce the mean speed of traffic by at least one quarter. Higher speeds are associated with longer trips. (C) 1998 Elsevier Science Ltd. All rights reserved.

Publication metadata

Author(s): Aljanahi AAM, Rhodes AH, Metcalfe AV

Publication type: Article

Publication status: Published

Journal: Accident Analysis and Prevention

Year: 1999

Volume: 31

Issue: 1-2

Pages: 161-168

Print publication date: 01/01/1999

ISSN (print): 0001-4575

ISSN (electronic): 1879-2057

Publisher: Elsevier Science Ltd


DOI: 10.1016/S0001-4575(98)00058-X


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